Originally posted by JrDavis
Originally posted by wmd_2008
reply to post by eriktheawful
I think he means the object being attracted having the smaller mass.
Anyway there are lots of objects with a far smaller mass than the Earth and closer to the edge of the solar system than Earth, what about the asteroid
belt THEY would be flying all over the place if his theory was true!
edit on 15-3-2013 by wmd_2008 because: (no reason given)
Right! And we are experiencing Meteors a lot lately.
However, There would have to be another variable.
Gravity is proportional to mass. Mass increases as you add energy. The asteroid belt is very cold.
Hot objects have more mass than a cold one. Cold objects have lower gravity.
This is in extreme situations. You would not knowingly notice this with everyday things.
I think it's something to experience in space.
I'm afraid that heating or cooling an object does not change it's mass. It can change it's volume or density (IE If you melt ice, but keep the
water it becomes contained, the water will still have the same mass as it did as an ice cube. Heat the water to steam, but again, keep the total
amount of water changed into a gas, and the mass of that gas will still equal the mass of the ice it came from, just that water and then gas cover
large volumes and are less dense).
Get a sensitive scale that can show weight to at least 3 digits, like 1.000 ouces. Find some small rocks or pebbles and weigh them at room temp. Now
put them in your oven set to it's highest setting (normally around 450 to 500 deg F. Let them sit in there for about an hour.
That amount of heat is not enough to change the state of the rocks from solid to liquid, but you have adding a very large amount of heat. While they
are still that hot, place them on the scale again. Note that the weight has not change. If you change their mass, then their weight will change here
E=mc^2 hold true. A mass has a certain amount of energy in it. But it's potential energy. If you add energy to the mass you don't actually change
the mass. All you've done is add energy to it.
If I pick up a rock, it has a certain amount of potential energy. However, that energy is dependent upon what the rock is doing.
If the rock is undergoing fusion or fission then E=mc^2 hold's true because we are talking about nuclear forces.
However, if the rock is just sitting there, the only energy it has is potential energy. If I pick the rock up and throw it, I have now changed it into
kinetic energy, which can be calculated by:
However the kinetic energy I just gave the rock by throwing it still does not change it's mass. The only ways I can change the rock's mass is:
1) I break it up into smaller pieces.
2) I add more rock to it.
3) I've become Superman and can throw the rock so fast, it almost reaches the speed of light (as relativistic effects happen at those velocities, and
the rock's mass will appear to increase to outside observers).
Heating up a rock will not change it's mass.....unless you heat it up to sublimate material off of it, or so that matter from it breaks off and
leaves it. Then yes, it's mass has change. But if it then cools off....the mass will not increase just because it cooled. You have to replace the
material it loss when you heated it up enough to loose that material in the first place.